What's included
Our dataset spans both for-sale and for-rent listings, standardised into a small, consistent set of property types (villa, apartment, studio, finca, townhouse, and so on), covering all of Mallorca's municipalities, towns and neighbourhoods (barrios). Rather than treating every source's own labelling as-is, we bring everything into one common structure so figures are genuinely comparable across areas and property types.
How duplicates are handled
The same real property is often advertised on more than one listing source at once, sometimes with slightly different photos, wording or price. We identify likely duplicates and group them together, which lets us present figures two ways: as raw totals (every listing as posted, summed across every source) and as deduplicated, unique-property estimates (after grouping likely duplicates of the same property). Neither number is "more correct" on its own, they answer different questions, and we say explicitly, wherever it matters, which figure is being shown.
Duplicate matching isn't left to software alone: once a likely match is identified, it goes through human review before it's treated as a confirmed duplicate, to keep the grouping accurate.
This matters because listings of the same property posted by different agencies often aren't identical. Details such as plot size, build size, listed features, and sometimes even the asking price can differ slightly between two postings of what is, on review, the same property, agencies commonly adjust or re-enter details in their own listing. A duplicate check based purely on matching statistics would miss cases like this, so we combine systematic matching with human review to catch duplicates that look statistically different but turn out, on inspection, to be the same property.
Data cleaning & standardisation
Raw listing data is messy by nature, so before it appears anywhere on the platform we clean and standardise it:
- Town and neighbourhood names are standardised to one consistent spelling per place, so the same location doesn't get fragmented into accent variants or alternate spellings across different sources.
- Property types are consolidated into a fixed, small set of categories, rather than the dozens of overlapping free-text labels sources use individually.
- Obviously implausible values, such as prices or sizes far outside anything realistic for the property described, are filtered out rather than shown as-is.
Feature extraction
Structured details, bedrooms, size, price, amenities and similar, are standardised from each listing's own description and data where the source provides them. Where a source simply doesn't include a particular field, we leave it blank rather than estimate or guess a value, so what you see reflects what was actually published.
Where the data comes from
Our data draws on two tiers of sources:
- Official and open sources: Catastro, Spain's cadastral registry, for property and cadastral records; INE (Instituto Nacional de Estadística) for demographic and statistical data; and municipal public registers.
- Property listings: a broad range of Spanish real estate websites and online data, independent estate agencies, franchises and property platforms operating in Mallorca.
Kept up to date
New real estate sources are added to our coverage over time. We hold and review the source list on an ongoing basis to keep it current as the market, and the sites operating in it, change.
The same applies to neighbourhoods, districts and areas: our breakdown reflects Mallorca to the best of our ability at any given time, and we review it on an ongoing basis so new developments and emerging areas on the island get added once they're established enough to be worth their own entry.
Roadmap
MallorcaData currently covers Mallorca. We plan to extend coverage across the rest of the Balearic Islands, Menorca, Ibiza and Formentera, over time.
This page explains how the data works. For live, per-source listing counts, see the Data Sources page; for the raw-vs-deduplicated totals breakdown, see Market Intelligence.
Frequently asked questions
Some pages show raw, undeduplicated totals (every listing as posted, summed across every source), and others show deduplicated, unique-property estimates (after grouping likely duplicates of the same real property together). Both are valid, they're just answering different questions; see the raw-vs-deduplicated breakdown on the Market Intelligence page for the full explanation.
Yes. Most of the data is provided to us directly from each independent real estate business, agency and agent. Beyond that, we aggregate publicly available property listing information, the same standard practice used by any property search or comparison site, together with genuinely public official data such as Catastro and INE records. We don't access anything private, paywalled, or access-restricted.
It's live and continuously updated, for both sale and rental listings, not a one-off export or a periodic batch snapshot.
We cover a very broad range of listings spanning all of Mallorca's municipalities, towns and neighbourhoods, but no aggregator can claim literally every property, on or off the market, at every moment. Coverage is tracked and expanded on an ongoing basis; see Data Sources for current per-source counts.